Preheat oven to 350°. In a small bowl, combine pecans, brown sugar and cinnamon; set aside.

In a large bowl, cream butter and sugar until light and fluffy. Add eggs, one at a time, beating well after each addition. Beat in vanilla. Combine flour, baking powder, baking soda and salt; add to creamed mixture alternately with sour cream, beating well after each addition.

Pour half of the batter into a greased and floured 10-in. fluted tube pan; sprinkle with half of the pecan mixture. Gently top with remaining batter and pecan mixture.

Bake 45-50 minutes or until a toothpick inserted in center comes out clean. Cool 10 minutes before removing from pan to a wire rack to cool completely. Sprinkle with confectioners' sugar.